older Craftsman jonters
My 30 yr old Craftsman jointer had NO outfeed adjustment. The knives were set to the height of the outfeed table... and that's all you can do. Maybe your is the same....?
Snipe is caused by the knives being set too high OR the infeed table is tilted in relation to the fixed outfeed table. Run the infeed up so it's flush with the outfeed at the cutterhead and see if there is any daylight showing under a straight 48" aluminum level. If so it's a bit complicated to fix, and some shimming may be required.
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)